support for latest pip

vendor/pip-pop/pip-diff

@@ -14,6 +14,9 @@ import os
 from docopt import docopt
 from pip.req import parse_requirements
 from pip.index import PackageFinder
+from pip._vendor.requests import session
+
+requests = session()
 
 class Requirements(object):
     def __init__(self, reqfile=None):
@@ -32,7 +35,7 @@ class Requirements(object):
         if not os.path.exists(reqfile):
             raise ValueError('The given requirements file does not exist.')
 
-        finder = PackageFinder([], [])
+        finder = PackageFinder([], [], session=requests)
         for requirement in parse_requirements(reqfile, finder=finder):
             if requirement.req:
                 self.requirements.append(requirement.req)

vendor/pip-pop/pip-grep

@@ -11,7 +11,9 @@ import os
 from docopt import docopt
 from pip.req import parse_requirements
 from pip.index import PackageFinder
+from pip._vendor.requests import session
 
+requests = session()
 
 class Requirements(object):
     def __init__(self, reqfile=None):
@@ -30,7 +32,7 @@ class Requirements(object):
         if not os.path.exists(reqfile):
             raise ValueError('The given requirements file does not exist.')
 
-        finder = PackageFinder([], [])
+        finder = PackageFinder([], [], session=requests)
         for requirement in parse_requirements(reqfile, finder=finder):
             self.requirements.append(requirement)